List.putAllBy.dart

extension PutListX<E> on List<E> {
  List<E> putAllBy<K>(Iterable<E> other, K onKey(E item), [void onAdd(E item)?]) {
    final Map<K, E> otherMap = other.associateBy<K>((it) => onKey(it));
    for (final i in indices) {
      final key = onKey(this[i]);
      if (otherMap.containsKey(key)) {
        this[i] = otherMap.remove(key) as E;
      }
    }

    otherMap.forEach((key, value) {
      add(value);
      onAdd?.call(value);
    });
    return this;
  }
}